1930, Suffolk

Marnie Watson has her whole life ahead of her. About to marry her sweetheart Tom, the future looks bright for the young couple.

But when the fishing industry begins to decline, Marnie's marriage is tested like never before. In a bid to reverse their fortunes, Marnie and Tom head west to Cornwall with the promise of a fresh start.

Before their new life can begin, tragedy strikes, threatening to destroy everything Marnie holds dear. And when war engulfs the world, Marnie's strength is tested further than she thought possible.

Marnie forms an unlikely friendship with gruff, sultry Jack Tristan, but their friendship will lead to devastating consequences, and the hardest choice Marnie has ever had to make.

Will Marnie make the right choice for her family? And will her sacrifice provide the future she wants for her children?